Creates a signature

Example request

{
  "data": [
    115,
    101,
    99,
    114,
    101,
    116,
    115
  ],
  "hashToDirectlySign": [],
  "protocolID": [
    0,
    "todo token"
  ],
  "keyID": "1",
  "privilegedReason": "I love to be secure",
  "counterparty": "anyone"
}